When we went to pick up our car, which we had booked on the web, from the Frankfurt airport Sixt office, they said that there was no demand or similar vehicle left, but that they could give a higher category without any difference. This pleased us and we checked and picked up our vehicle and set off for our vacation. Sixt never leaves you on the road, it is always by your side. Maybe this luck belongs to me, it may not be the same for everyone. Thanks a lot once again to Sixt...all the best